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To perform a hard reset you need to press buttons 1 and 4 in addition to the reset hole. This should do the trick.

The guidelines for resetting your phone is given below

Performing a Hard Reset

Perform a hard reset only when you want to clear alluser-installed settings, applications, and data from RAM(Random Access Memory), where data and applications you haveloaded are stored.

CAUTION: If you perform a hard reset, your Pocket PC loses all dataand programs not saved in iPAQ File Store.

To perform a hard reset:

1. Press and hold down the Calendar and iTask buttons.2. While holding down these buttons, use the stylus tolightly press the Reset button on the bottom of the iPAQPocket PC for about two seconds.

HP iPAQ hx2410 Hard reset

3. When the Pocket PC screen begins to fade, release theCalendar and iTask buttons first, and then remove the stylusfrom the Reset button.

Note: If you simultaneously push and hold the Reset, Calendar,and iTask buttons for more than two seconds, the batterydisconnects. To restart the device, either plug the device into theAC Adapter or press the Reset button again.After performing a hard reset, you may need to reinstallapplications stored in iPAQ File Store to restore shortcuts and fullfunctionality.

u have given a wrong Model number this is not a model number infact a part number pls try to find the correct model number from HP site thru photo identification if u dont find ur model other wise i am providing u detail below to try the hard reset on various series of HP IPAQS kindly be sure that ur ALL DATA WILL BE ERASED pls rate me FIXYA if i fixed ur problem

How to Perform a Hard Reset on an HP iPAQ

Performing a hard reset on an HP iPAQ is relatively easy, but is a dramatic step in the management of your handheld organizer. A hard reset will completely clear the memory of your device and restore it to the state you received it in from the factory. A soft reset, on the other hand, simply closes running programs and restarts your pocket PC.

InstructionsDifficulty: Moderately EasyStep1Read the owner’s manual. If you don’t have to do a hard reset, you shouldn’t, and you definitely don’t want to do one by accident. So familiarize yourself with the hard reset protocol offered in the manual.Step2Make sure you want to clear all personal settings, saved data and personal files from your PDA. If there are files you wish to retain, save them to a removable disk, or send them to your computer’s hard drive to be retrieved at a later date before performing a hard reset.Step3For the HP iPAQ h1900 series, hold down the power button while you use your stylus to hold down the reset button (on the left side of the iPAQ). Hold these buttons for a few seconds until the screen fades to black.Step4For the HP iPAQ h2000 Series, press down on the far left and right buttons (calendar and iTask, respectively). While you do this, press and hold the reset button on the back of the iPAQ until the screen fades.Step5For the HP iPAQ h5000 Series and H3800 Series, the procedure is the same as the h2000 Series with the only difference being on some models the Today button is used instead of the iTask button.Step6For the hw6500 Mobile Messenger Series and hx2000 Series the procedure for the hard reset is precisely the same as for the devices in step 4.Step7For the rx3115 and rx3715 models, hold down the Mobile Media button (on the far left) and the iTask button. Then press down the reset button with the styles for a few seconds until the screen goes dark.Step8For the rz1710 and rz1715, follow the same procedure as the devices in step 7, with the difference of pressing the Today button (on the far right) instead of the iTask button.Step9To turn on your HP iPAQ after your hard reset, either press the reset button again, or plug it into an AC power source.

Tips & Warnings

* If you’re iPAQ is simply slowing down or having problems, try a soft reset (reboot) before resorting to a hard reset. * Read your iPAQ’s instruction manual to familiarize yourself with how to do a hard reset, and the effects of performing one. * Do not perform a hard reset unless you are okay with or intend to erase all non-factory installed data and settings from your HP iPAQ.

Performing a Full Reset
A full reset is sometimes referred to as a ?hard reset.? Perform a full reset when you want to clear all settings, programs, and data from RAM.
A full reset deactivates the battery. The power button does not function until the battery is reactivated.
CAUTION: If you perform a full reset, your iPAQ Pocket PC returns to its default settings and loses all information that is not recorded
in ROM.
To perform a full reset:
1. Press and hold Application Buttons 1 (Calendar) and 4 (iTask) on the front of the unit and, at the same time, use the stylus to press the Reset button on the bottom of your iPAQ Pocket PC.
2. Hold all buttons until the displayed
Full PDF document can be found here:
http://h20000.www2.hp.com/bc/docs/support/SupportManual/lpia8006/lpia8006.pdf